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Arms In, Spin Faster
Age 13 · Physics
When a spinning person pulls weights closer to their body, the spin gets faster. Moving mass inward makes the same spin happen in less time.
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Age 13: open this week
Browse Age 13
In the picture
- A dumbbell held far from the stool’s center on an outstretched arm
- A dumbbell held close to the chest with bent arms
- A wide curved arrow around the left stool, one slow turn
- A tight cluster of curved arrows around the right stool, a fast spin
Examples
- A figure skater pulling in their arms during a spin
- A diver tucking into a ball to spin faster
Key takeaways
- Pulling mass toward the center makes a spin faster.
- Pushing mass away from the center makes a spin slower.
Quiz: Arms In, Spin Faster (Age 13)
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When a spinning person pulls the weights closer to their body, what happens to the spin?
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When mass is pushed away from the center of a spinning person, what happens to the spin?
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When mass moves inward on a spinning object, what happens to the time for one full spin?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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